THERMODYNAMICS AND KINETICS OF ADSORPTION OF DIMETHYL SULFIDE ON COPPER-LOADED ACTIVATED CARBON

Abstract

Abstract: Copper-loaded activated carbon (J-AC) as the adsorbent, dimethyl sulfide in the petroleum ether solution for adsorption, through the specific surface area analyzer for specific surface area and pore structure of the adsorbent were characterized. Thermodynamics and kinetics model was used to analyze the experimental data fitting and the calculation of thermodynamic and kinetic parameters, and J-AC the adsorption mechanism of dimethyl sulfide was discussed. The results showed that the adsorption of dimethyl sulfide by J-AC was in line with the Freundlich isothermal adsorption equation, the fitting correlation coefficient was greater than 0.996, and the adsorption free energy, adsorption heat and adsorption entropy at different temperatures were all less than 0. The adsorption process was a spontaneous process in which the confusion degree of exothermic heat decreased. The adsorption kinetics of the process was in line with the pseudo-second-order kinetic model, and the fitting correlation coefficient was greater than 0.992. With the increase of the initial concentration of dimethyl sulfide, the pseudo-second-order rate constant gradually decreased.

Key words: copper-loaded activated carbon, dimethyl sulfide, adsorption thermodynamics, adsorption kinetics

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